package ch02.impl;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.FileOutputStream;
import java.io.IOException;

public class Ex4Impl {
    public static void main(String[] args) throws ParserConfigurationException, IOException, SAXException, TransformerException {
        //得到DOM解析器的工厂实例
        DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
        //从DOM工厂获得DOM解析器
        DocumentBuilder db=dbf.newDocumentBuilder();
        Document doc= db.parse("test/ch02/exXml/ex1.xml");
        //创建Brand节点
        Element brandElement=doc.createElement("Brand");
        brandElement.setAttribute("name", "三星");
        //创建Type节点
        Element typeElement=doc.createElement("Type");
        typeElement.setAttribute("name", "NoteX");
        //添加父子关系
        brandElement.appendChild(typeElement);
        Element phoneElement=(Element) doc.getElementsByTagName("PhoneInfo").item(0);
        phoneElement.appendChild(brandElement);
        //保存XML文件
        TransformerFactory transformerFactory=TransformerFactory.newInstance();
        Transformer transformer=transformerFactory.newTransformer();
        DOMSource domSource=new DOMSource(doc);
        //设置编码类型
        transformer.setOutputProperty(OutputKeys.ENCODING,"gb2312");
        StreamResult result=new StreamResult(new FileOutputStream("test/ch02/exXml/ex1.xml"));
        //把DOM树转换为XML文件
        transformer.transform(domSource,result);
    }
}
